1. Department of Internal Medicine, Section Endocrinology Amsterdam Bone Center Amsterdam University Medical Center Amsterdam The Netherlands
2. Department of Ophthalmology Amsterdam University Medical Center Amsterdam The Netherlands
3. Department of Clinical Genetics Amsterdam Movement Sciences Amsterdam University Medical Center Amsterdam The Netherlands
4. Department of Clinical Chemistry, Bone and Calcium Metabolism Lab Amsterdam University Medical Center Amsterdam The Netherlands
5. Centre for Genomic and Experimental Medicine MRC Institute of Genetics and Molecular Medicine University of Edinburgh Edinburgh UK
6. Medical library Vrije Universiteit Amsterdam The Netherlands